This downpipe comes with a pre-welded High Flow Cat, making it 49 State EPA OBD-II Street Legal (not for use in CA). The cat is made by Magnaflow (Thunderbolt used in some cases). The pipe diameter is smooth mandrel bent, 2.5 inches. All OEM O2 bungs are pre-welded to this downpipe for easy installation.

Because of the smooth mandrel bends and easy curves, our downpipe will allow more air movement and boost horsepower for your car. This part is an excellent addition to an exhaust system. Our downpipe features simple weld construction; less flanges and adaptors allow for smooth airflow. Our flanges are cut precise using waterjet machines, for burr free installation.

Average install time is 1 hour. Expect an increase in exhaust volume, with a deeper mellow tone, and an increase in power between 8-15 HP at the wheels. Item ships as downpipe only and does include gaskets.

NOTE: We ship all orders with default outlet sizes following the tube diameter. (i.e. If you order a 3 inch downpipe, we will ship a true 3 inch outlet, measures O.D.) If you prefer to have a reduced outlet size please select below.

NOTE: Please check your header flange before ordering. In most cases the header/manifold flange can be seen by looking under the hood toward the firewall of the car.